Magento Random suffix on product url

On my product pages I get a random string appended when I view the product pages.

#.UQmwxq5rMaU  -> is random for each user

I have disabled the sid and this issue only appears on product pages.

Any ideas?
Who is Participating?
oberon99Connect With a Mentor Author Commented:
This additional code was being added onto the URL string by the "Add This" plugin!

Problem solved :)
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